US20230208223A1 - Motor, compressor, and refrigeration cycle apparatus - Google Patents

Motor, compressor, and refrigeration cycle apparatus Download PDF

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Publication number
US20230208223A1
US20230208223A1 US17/999,272 US202017999272A US2023208223A1 US 20230208223 A1 US20230208223 A1 US 20230208223A1 US 202017999272 A US202017999272 A US 202017999272A US 2023208223 A1 US2023208223 A1 US 2023208223A1
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United States
Prior art keywords
core
hole
central axis
motor according
radial direction
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Abandoned
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US17/999,272
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English (en)
Inventor
Kazuhiko Baba
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BABA, KAZUHIKO
Publication of US20230208223A1 publication Critical patent/US20230208223A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/026—Compressor arrangements of motor-compressor units with compressor of rotary type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present disclosure relates to a motor, a compressor, and a refrigeration cycle apparatus.
  • a compressor used in a refrigeration cycle apparatus includes a compression mechanism and a motor that drives the compression mechanism.
  • a consequent pole motor as the motor of the compressor has been proposed (see, for example, Patent Reference 1).
  • Patent Reference 1 Japanese Patent Application Publication No.2012-244783 (see FIG. 10 )
  • the present disclosure is intended to solve the above-described problem, and an object of the present disclosure is to reduce magnetic flux leakage from a rotor to a rotary shaft.
  • a motor according to the present disclosure is a motor used in a compressor, the motor including a rotor including a rotor core fixed to a rotary shaft of the compressor, and a permanent magnet fixed to the rotor core, and a stator including a stator core surrounding the rotor core from outside in a radial direction about a central axis of the rotary shaft.
  • the rotor core has a first core and a second core in a direction of the central axis.
  • the first core has a hole portion at a center thereof in the radial direction, and has a magnet insertion hole located on an outer side of the hole portion in the radial direction.
  • the permanent magnet is inserted in the magnet insertion hole.
  • the permanent magnet constitutes a magnet magnetic pole, and a part of the first core constitutes a pseudo magnetic pole.
  • the second core has a shaft hole at a center thereof in the radial direction, and the rotary shaft is fixed to the shaft hole. An inner circumference of the hole portion of the first core is distanced from the rotary shaft in the radial direction.
  • the second core is located on an outer side of the stator core in the direction of the central axis. The second core is not in contact with the permanent magnet.
  • the first core to which the permanent magnet is fixed does not contact the rotary shaft, and thus the leakage magnetic flux flowing from the permanent magnet to the rotary shaft can be reduced.
  • FIG. 1 is a longitudinal-sectional view illustrating a compressor of a first embodiment.
  • FIG. 2 is a longitudinal-sectional view illustrating a motor of the first embodiment.
  • FIG. 3 is a cross-sectional view illustrating the motor of the first embodiment.
  • FIG. 4 is a cross-sectional view illustrating a rotor of the first embodiment.
  • FIG. 5 is a cross-sectional view illustrating a first core of the rotor of the first embodiment.
  • FIG. 6 is a cross-sectional view illustrating a second core of the rotor of the first embodiment.
  • FIG. 7 (A) is a diagram illustrating a magnet insertion hole in the first core of the first embodiment
  • FIG. 7 (B) is a diagram illustrating a slit hole in the second core of the first embodiment.
  • FIG. 8 is a diagram illustrating the dimensions of respective parts in the motor of the first embodiment.
  • FIG. 9 is a cross-sectional view illustrating a compression mechanism of the first embodiment.
  • FIG. 10 is a graph illustrating the relationship between (R1 ⁇ R2)/(R3 ⁇ R1) and the induced voltage in the first embodiment.
  • FIG. 11 is a sectional view illustrating a second core of a first modification of the first embodiment.
  • FIG. 12 (A) is a diagram illustrating a magnet insertion hole in a first core of a second modification of the first embodiment
  • FIG. 12 (B) is a diagram illustrating a slit hole in a second core of the second modification.
  • FIG. 13 (A) is a diagram illustrating a magnet insertion hole in a first core of a third modification of the first embodiment
  • FIG. 13 (B) is a diagram illustrating a slit hole in a second core of the third modification.
  • FIG. 14 (A) is a diagram illustrating a magnet insertion hole in a first core of a fourth modification of the first embodiment
  • FIG. 14 (B) is a diagram illustrating a slit hole in a second core of the fourth modification.
  • FIG. 15 is a longitudinal-sectional view illustrating a motor of a second embodiment.
  • FIG. 16 is a longitudinal-sectional view illustrating a motor of a third embodiment.
  • FIG. 17 is a longitudinal-sectional view illustrating a rotor of a fourth embodiment.
  • FIG. 18 is a longitudinal-sectional view illustrating a rotor of a fifth embodiment.
  • FIG. 19 is a longitudinal-sectional view illustrating a rotor of a modification of the fifth embodiment.
  • FIG. 20 is a longitudinal-sectional view illustrating another configuration example of the motor.
  • FIG. 21 is a diagram illustrating a refrigeration cycle apparatus to which a compressor including the motor of each of the embodiments and the modifications is applicable.
  • FIG. 1 is a longitudinal-sectional view illustrating a compressor 8 of a first embodiment.
  • the compressor 8 is a rotary compressor.
  • the compressor 8 includes a compression mechanism 7 , a motor 6 that drives the compression mechanism 7 , a rotary shaft 20 that connects the compression mechanism 7 and the motor 6 , and a sealed container 80 that houses these components.
  • the axial direction of the rotary shaft 20 is the vertical direction, and the motor 6 is disposed above the compression mechanism 7 .
  • the direction of a central axis C 1 which is the rotation center of the rotary shaft 20 , is referred to as an “axial direction”.
  • the radial direction about the central axis C 1 is referred to as a “radial direction”
  • the circumferential direction (indicated by the arrow R in FIG. 3 ) about the central axis C 1 is referred to as a “circumferential direction”.
  • the sectional view in a plane parallel to the central axis C 1 is referred to as a longitudinal-sectional view, whereas the sectional view in a plane perpendicular to the central axis C 1 is referred to as a cross-sectional view.
  • the sealed container 80 is a cylindrical container formed of a steel sheet.
  • a stator 5 of the motor 6 is incorporated inside the sealed container 80 by shrink-fitting, press-fitting, or welding.
  • refrigerant oil is stored as a lubricant for lubricating sliding portions of the compression mechanism 7 .
  • the top of the sealed container 80 is provided with a discharge pipe 85 for discharging the refrigerant to the outside and terminals 83 connected to coils 55 of the stator 5 via lead wires 84 .
  • the terminals 83 are connected to a control circuit provided outside the compressor 8 and including an inverter.
  • An accumulator 81 that stores a refrigerant gas is attached to the outside of the sealed container 80 .
  • FIG. 2 is a longitudinal-sectional view illustrating the motor 6 .
  • FIG. 3 is a sectional view taken along the line illustrated in FIG. 2 .
  • the motor 6 includes a rotor 1 fixed to the rotary shaft 20 and the stator 5 surrounding the rotor 1 from outside in the radial direction.
  • a gap of, for example, 0.3 to 1.0 mm is formed between the rotor 1 and the stator 5 .
  • the stator 5 has a stator core 50 and the coils 55 wound on the stator core 50 .
  • the stator core 50 is made of a soft magnetic material. More specifically, the stator core 50 is made of a stacked body in which a plurality of electromagnetic steel sheets are stacked. The sheet thickness of each electromagnetic steel sheet is, for example, 0.1 to 0.7 mm.
  • the outer circumference of the stator core 50 is fit to the inner circumference of the sealed container 80 ( FIG. 1 ).
  • the stator core 50 has a first end surface 501 facing the compression mechanism 7 ( FIG. 1 ) and a second end surface 502 on a side opposite to the first end surface 501 .
  • the stator core 50 has a yoke 51 which is annular about the central axis C 1 and a plurality of teeth 52 extending inward in the radial direction from the yoke 51 .
  • the yoke 51 may be made by combining a plurality of blocks (split cores) divided for each tooth 52 , or may be integrally formed in an annular shape.
  • the teeth 52 are arranged at certain intervals in the circumferential direction.
  • the number of teeth 52 is nine in this example. In this regard, the number of teeth 52 is not limited to nine but only needs to be two or more.
  • a slot 53 which is a space to house the coil 55 , is formed between teeth 52 adjacent to each other in the circumferential direction.
  • the coil 55 is a magnet wire wound around the tooth 52 via an insulating portion.
  • a winding method of the coil 55 is concentrated winding in this example, but may be distributed winding.
  • the insulating portion is made of a resin such as polybutylene terephthalate (PBT), for example.
  • the rotor 1 has a rotor core 10 and permanent magnets 18 attached to the rotor core 10 .
  • the rotor core 10 is divided into a first core 10 A and a second core 10 B in the axial direction.
  • Both the first core 10 A and the second core 10 B are cylindrical.
  • the first core 10 A is located on the compression mechanism 7 side ( FIG. 1 ), while the second core 10 B is located on a side opposite to the compression mechanism 7 .
  • the first core 10 A and the second core 10 B will be described in this order.
  • the first core 10 A has a first end surface 101 facing the compression mechanism 7 ( FIG. 1 ) and a second end surface 102 on a side opposite to the first end surface 101 .
  • the first core 10 A is made of a soft magnetic material. More specifically, the first core 10 A is made of a stacked body in which a plurality of electromagnetic steel sheets are stacked. The sheet thickness of each electromagnetic steel sheet is, for example, 0.1 to 0.7 mm.
  • FIG. 4 is a cross-sectional view of the rotor 1 cut in a plane passing through the first core 10 A and being perpendicular to the axial direction.
  • the first core 10 A has an annular outer circumference 16 A, and has a hole portion 15 A at its center in the radial direction. Both the outer circumference 16 A and the inner circumference of the hole portion 15 A are circular about the central axis C 1 . The inner circumference of the hole portion 15 A is distanced from the rotary shaft 20 in the radial direction.
  • a plurality of magnet insertion holes 11 A are formed along the outer circumference 16 A of the first core 10 A.
  • the magnet insertion holes 11 A are arranged at equal intervals in the circumferential direction and also at equal distances from the central axis C 1 .
  • Each magnet insertion hole 11 A extends in the axial direction from the first end surface 101 to the second end surface 102 ( FIG. 2 ) of the first core 10 A.
  • the number of magnet insertion holes 11 A is four in this example, but is not limited to four. The number of magnet insertion holes 11 A only needs to be two or more.
  • Each magnet insertion hole 11 A corresponds to one magnetic pole in this example.
  • the central portion of the magnet insertion hole 11 A in the circumferential direction is a pole center.
  • the magnet insertion hole 11 A extends linearly in a direction perpendicular to a straight line in the radial direction passing through the pole center, i.e., a magnetic pole center line.
  • the flat plate-shaped permanent magnet 18 is inserted in each magnet insertion hole 11 A.
  • the permanent magnet 18 has a rectangular sectional shape in a plane perpendicular to the axial direction and has a width in the circumferential direction and a thickness in the radial direction.
  • the thickness of the permanent magnet 18 is, for example, 2 mm.
  • a length Lm ( FIG. 8 ) of the permanent magnet 18 in the axial direction is less than or equal to a length Ls ( FIG. 8 ) of the first core 10 A in the axial direction.
  • the permanent magnet 18 is a rare earth magnet and is, more specifically, a neodymium sintered magnet containing Nd (neodymium)-Fe (iron)-B (boron).
  • the permanent magnet 18 is magnetized in its thickness direction.
  • the permanent magnets 18 are arranged so that the same magnetic poles (for example, the N poles) thereof face the outer circumference 16 A side. Consequently, in a region of the first core 10 A between the permanent magnets 18 adjacent to each other in the circumferential direction, a magnetic pole (for example, the S pole) opposite to that of the permanent magnets 18 is formed.
  • the permanent magnets 18 constitute magnet magnetic poles P 1 (first magnetic poles), and the first core 10 A constitutes pseudo magnetic poles P 2 (second magnetic poles).
  • the magnet magnetic poles P 1 and the pseudo magnetic poles P 2 are alternately arranged in the circumferential direction. This configuration is referred to as a consequent pole type.
  • the first core 10 A has four magnet magnetic poles P 1 and four pseudo magnetic poles P 2 . That is, the number of poles is eight.
  • the magnetic poles P 1 and P 2 are arranged at equal angular intervals in the circumferential direction with a pole pitch of 45 degrees (360 degrees/8).
  • magnetic pole indicates either the magnet magnetic pole P 1 or the pseudo magnetic pole P 2 .
  • each magnet insertion hole 11 A may have a V shape, and two or more magnet insertion holes 11 A may be provided for one magnetic pole.
  • FIG. 5 is a plan view illustrating the first core 10 A.
  • the magnet insertion hole 11 A has an inner end edge 111 located on the inner side in the radial direction, an outer end edge 112 located on the outer side in the radial direction, and side end edges 113 located on both ends in the circumferential direction.
  • the inner end edge 111 and the outer end edge 112 are parallel to each other.
  • the two side end edges 113 are inclined so that the interval therebetween is larger at the outer side in the radial direction than at the inner side in the radial direction.
  • a flux barrier 12 ( FIG. 4 ), which is an opening, is formed between the side end edge 113 of the magnet insertion hole 11 A and the permanent magnet 18 .
  • a thin-walled part is formed between the flux barrier 12 and the outer circumference 16 A. In order to reduce leakage magnetic flux between adjacent magnetic poles, the thickness of the thin-walled part is set, for example, equal to the sheet thickness of the electromagnetic steel sheet.
  • Through holes 13 are formed on the outer side of the hole portion 15 A of the first core 10 A in the radial direction.
  • Each through hole 13 is a hole through which a rivet 19 is inserted and is also referred to as a rivet hole.
  • there are provided four through holes 13 the number of which is the same as the number of poles.
  • the four through holes 13 are arranged at equal intervals in the circumferential direction and also at equal distances from the central axis C 1 .
  • the position of each through hole 13 in the circumferential direction is the same as the position of the pseudo magnetic pole P 2 in the circumferential direction.
  • the number and arrangement of through holes 13 are not limited to the examples described herein.
  • the rivet 19 ( FIG. 2 ) is inserted into the through hole 13 to fasten the first core 10 A and the second core 10 B from both sides thereof in the axial direction.
  • the rivet 19 is desirably made of a nonmagnetic material such as stainless steel. This is to suppress the flow of the magnetic flux from the first core 10 A to the second core 10 B through the rivet 19 .
  • the second core 10 B has a first end surface 103 on the first core 10 A side and a second end surface 104 on a side opposite to the first end surface 103 .
  • the first end surface 103 of the second core 10 B is in contact with the second end surface 102 of the first core 10 A.
  • the second core 10 B is made of a soft magnetic material. More specifically, the second core 10 B is made of a stacked body in which a plurality of electromagnetic steel sheets are stacked.
  • the sheet thickness of each electromagnetic steel sheet is, for example, 0.1 to 0.7 mm.
  • FIG. 6 is a plan view illustrating the second core 10 B.
  • the second core 10 B has an annular outer circumference 16 B, and has a shaft hole 15 B at its center in the radial direction. Both the outer circumference 16 B and the inner circumference of the shaft hole 15 B are circular about the central axis C 1 .
  • the outer diameter of the second core 10 B is the same as the outer diameter of the first core 10 A.
  • the outer circumference 16 B of the second core 10 B is located at the same position in the radial direction as the outer circumference 16 A of the first core 10 A.
  • the inner diameter of the shaft hole 15 B in the second core 10 B is smaller than the inner diameter of the hole portion 15 A in the first core 10 A.
  • the rotary shaft 20 ( FIG. 4 ) is fitted into the shaft hole 15 B of the second core 10 B by shrink-fitting or press-fitting.
  • the inner diameter of the shaft hole 15 B is smaller than the inner diameter of the hole portion 15 A, a part of the first end surface 103 ( FIG. 2 ) of the second core 10 B faces a cavity portion inside the hole portion 15 A of the first core 10 A.
  • a plurality of slit holes 11 B are formed along the outer circumference 16 B of the second core 10 B.
  • the slit holes 11 B are arranged at equal intervals in the circumferential direction and also at equal distances from the central axis C 1 .
  • Each slit hole 11 B extends in the axial direction from the first end surface 103 to the second end surface 104 of the second core 10 B ( FIG. 2 ).
  • the slit holes 11 B are formed at positions that overlap the magnet insertion holes 11 A. That is, the slit hole 11 B communicates with the magnet insertion hole 11 A. In this regard, no permanent magnet 18 ( FIG. 4 ) is inserted in the slit hole 11 B.
  • the slit hole 11 B has an inner end edge 115 located on the inner side in the radial direction, an outer end edge 116 located on the outer side in the radial direction, and side end edges 117 located on both ends in the circumferential direction.
  • the end edges 115 , 116 , and 117 of the slit hole 11 B correspond to the end edges 111 , 112 , and 113 of the magnet insertion hole 11 A, respectively.
  • a plurality of air holes 14 as opening portions are formed on the outer side of the shaft hole 15 B of the second core 10 B in the radial direction.
  • Each air hole 14 is a passage for the refrigerant in the compressor 8 .
  • 12 air holes 14 are formed at equal intervals in the circumferential direction and also at equal distances from the central axis C 1 . In this regard, the number of air holes 14 is not limited.
  • the air holes 14 are desirably disposed close to each other.
  • the distance between adjacent air holes 14 i.e., the width of a core portion between the adjacent air holes 14 , is desirably smaller than the diameter of each air hole 14 .
  • the air holes 14 are located on the inner side in the radial direction with respect to the inner circumference of the hole portion 15 A in the first core 10 A. Thus, the air holes 14 communicate with the cavity portion inside the hole portion 15 A of the first core 10 A. All the air holes 14 communicate with the cavity portion in this example, but at least one air hole 14 may communicate with the cavity portion.
  • the air holes 14 communicate with the cavity portion inside the first core 10 A, the refrigerant flowing from the compression mechanism 7 into the cavity portion inside the first core 10 A passes through the air holes 14 .
  • the air holes 14 promote separation between the refrigerant and refrigerant oil.
  • the refrigerant oil is inhibited from flowing to the outside of the compressor 8 .
  • the plurality of air holes 14 are formed around the shaft hole 15 B of the second core 10 B, and thus the air holes 14 also have the effect of inhibiting the flow of magnetic flux from the second core 10 B to the rotary shaft 20 .
  • Through holes 13 are formed on the outer side of the air holes 14 of the second core 10 B in the radial direction. Each through hole 13 extends from the first end surface 103 to the second end surface 104 of the second core 10 B in the axial direction. The through holes 13 of the second core 10 B are located at the same positions as the through holes 13 of the first core 10 A in a plane perpendicular to the axial direction.
  • FIG. 7 (A) is a schematic diagram for explaining the shape of the magnet insertion hole 11 A.
  • FIG. 7 (B) is a schematic diagram for explaining the shape of the slit hole 11 B.
  • the magnet insertion hole 11 A has a length W 1 in the circumferential direction and a width T 1 in the radial direction.
  • the length W 1 is a length of the outer end edge 112
  • the width T 1 is a distance between the inner end edge 111 and the outer end edge 112 .
  • the slit hole 11 B has a length W 2 in the circumferential direction and a width T 2 in the radial direction.
  • the length W 2 is a length of the outer end edge 116
  • the width T 2 is a distance between the inner end edge 115 and the outer end edge 116 .
  • W2>W1 and T2>T1 may be satisfied.
  • the slit hole 11 B desirably has the shape that surrounds the magnet insertion hole 11 A from outside in a plane perpendicular to the axial direction.
  • the permanent magnet 18 in the magnet insertion hole 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and therefore the flow of magnetic flux from the permanent magnet 18 to the second core 10 B can be suppressed.
  • FIG. 8 is a diagram for explaining the dimensions of respective parts of the rotor 1 .
  • the distance from the central axis C 1 to the inner circumference of the hole portion 15 A of the first core 10 A is denoted as a distance R 1 .
  • the distance from the central axis C 1 to the inner circumference of the shaft hole 15 B of the second core 10 B is denoted as a distance R 2 .
  • the distances R 1 and R 2 satisfy R1>R2.
  • the inner diameter (R1 ⁇ 2) of the hole portion 15 A of the first core 10 A is larger than the inner diameter (R2 ⁇ 2) of the shaft hole 15 B of the second core 10 B.
  • the distance from the central axis C 1 to the outer circumference 16 A of the first core 10 A is denoted as a distance R 3 .
  • the distance from the central axis C 1 to the outer circumference 16 B of the second core 10 B is denoted as a distance R 4 .
  • the outer diameter (R3 ⁇ 2) of the first core 10 A is the same as the outer diameter (R4 ⁇ 2) of the second core 10 B.
  • the first core 10 A has a length L 1 in the axial direction
  • the second core 10 B has a length L 2 in the axial direction
  • the stator core 50 has a length Ls in the axial direction
  • the permanent magnet 18 has a length Lm in the axial direction.
  • the length L 1 of the first core 10 A in the axial direction is greater than or equal to the length Ls of the stator core 50 in the axial direction (L1 ⁇ Ls).
  • the first end surface 101 of the first core 10 A is located at the same position in the axial direction as the first end surface 501 of the stator core 50 .
  • the first core 10 A faces the stator core 50 in the radial direction, while the second core 10 B does not face the stator core 50 in the radial direction.
  • the second core 10 B is located so as to protrude from the stator core 50 in the axial direction. Since the magnetic flux flows mainly between the permanent magnet 18 and the stator core 50 , the magnetic flux is less likely to flow to the second core 10 B because the second core 10 B protrudes from the stator core 50 in the axial direction.
  • the length L 1 of the first core 10 A in the axial direction is longer than the length L 2 of the second core 10 B in the axial direction (L1>L2).
  • L1>L2 the length of the permanent magnet 18 in the axial direction
  • L 2 of the second core 10 B the length of the rotor 1 in the axial direction can be shortened, and thus weight reduction can be achieved.
  • the lengths L 1 , L 2 , and Ls of the first core 10 A, the second core 10 B and the stator core 50 desirably satisfy L1 ⁇ Ls>L2.
  • the length Lm of the permanent magnet 18 in the axial direction is desirably shorter than the length L 1 of the first core 10 A in the axial direction. In this case, the permanent magnet 18 is distanced from the second core 10 B in the axial direction, and thus the magnetic flux of the permanent magnets 18 is less likely to flow to the second core 10 B.
  • the length Lm of the permanent magnet 18 in the axial direction is desirably less than or equal to the length Ls of the stator core 50 in the axial direction. In this case, the magnetic flux of the permanent magnets 18 can be efficiently interlinked with the stator core 50 .
  • the compression mechanism 7 of the compressor 8 has a cylinder 71 , a rolling piston 73 , a main bearing 75 , and an auxiliary bearing 76 .
  • the cylinder 71 has a cylindrical cylinder chamber 72 surrounding the rotary shaft 20 .
  • the cylinder chamber 72 has an opening on each of the upper and lower ends thereof, and these openings are closed by the main bearing 75 and the auxiliary bearing 76 .
  • the main bearing 75 has a flat plate portion 75 a that closes the upper opening of the cylinder chamber 72 and a bearing portion 75 b that rotatably supports the rotary shaft 20 .
  • the bearing portion 75 b is a sliding bearing.
  • the main bearing 75 is made of a magnetic material such as iron and is fixed to an upper surface of the cylinder 71 by bolts or the like.
  • An upper end of the main bearing 75 is located below the first end surface 101 of the rotor 1 . This is to prevent the magnetic flux of the permanent magnets 18 from affecting the main bearing 75 made of the magnetic material.
  • the auxiliary bearing 76 has a flat plate portion 76 a that closes the lower opening of the cylinder chamber 72 and a bearing portion 76 b that rotatably supports the rotary shaft 20 .
  • the bearing portion 76 b is a sliding bearing.
  • the auxiliary bearing 76 is made of a magnetic material such as iron and is fixed to a lower surface of the cylinder 71 by bolts or the like.
  • FIG. 9 is a cross-sectional view illustrating the compression mechanism 7 .
  • the rotary shaft 20 has an eccentric shaft portion 20 a located inside the cylinder chamber 72 .
  • the eccentric shaft portion 20 a has an eccentric shape with respect to the central axis C 1 .
  • the annular rolling piston 73 is fitted to the outer circumference of the eccentric shaft portion 20 a.
  • the eccentric shaft portion 20 a and the rolling piston 73 rotate in the cylinder chamber 72 by the rotation of the rotary shaft 20 .
  • the rotary shaft 20 is made of a magnetic material such as iron.
  • a center hole 20 b is formed for supplying the refrigerant oil retained at the bottom of the sealed container 80 to sliding portions of the compression mechanism 7 .
  • the center hole 20 b is omitted in FIG. 1 described above.
  • the cylinder 71 is provided with a suction port 77 through which the refrigerant gas is sucked into the cylinder chamber 72 from the outside of the sealed container 80 .
  • a suction pipe 82 of the accumulator 81 ( FIG. 1 ) is connected to the suction port 77 .
  • the accumulator 81 separates the refrigerant into the liquid refrigerant and the refrigerant gas and supplies only the refrigerant gas to the suction port 77 via the suction pipe 82 .
  • the cylinder 71 has a vane groove 71 a extending in the radial direction. One end of the vane groove 71 a communicates with the cylinder chamber 72 . A back pressure chamber 71 b is formed on the other end of the vane groove 71 a. A vane 74 is inserted into the vane groove 71 a.
  • the vane 74 can reciprocate within the vane groove 71 a.
  • a spring is provided in the back pressure chamber 71 b, and presses the vane 74 from the vane groove 71 a into the cylinder chamber 72 , so that the tip of the vane 74 is brought into contact with an outer circumferential surface of the rolling piston 73 .
  • the vane 74 partitions a space formed by an inner circumferential surface of the cylinder chamber 72 and an outer circumferential surface of the rolling piston 73 into two operation chambers.
  • one operation chamber that communicates with the suction port 77 functions as a suction chamber into which the low-pressure refrigerant gas is sucked, while the other operation chamber functions as a compression chamber in which the refrigerant is compressed.
  • the cylinder 71 is provided with a discharge port through which the refrigerant gas compressed in the cylinder chamber 72 is discharged.
  • the main bearing 75 is provided with a discharge opening communicating with the discharge port of the cylinder 71 and a discharge valve.
  • the discharge valve opens when the pressure of the refrigerant gas in the cylinder chamber 72 is higher than or equal to the specified pressure, and causes the refrigerant gas to be discharged into the sealed container 80 .
  • the refrigerant gas discharged from the cylinder chamber 72 into the sealed container 80 flows upward within the sealed container 80 .
  • the refrigerant gas flows through the air holes 14 of the rotor 1 in the motor 6 and also through a gap between the rotor 1 and the stator 5 , and is discharged through the discharge pipe 85 to the outside.
  • the operation of the compressor 8 ( FIG. 1 ) is as follows.
  • the attraction force or repulsive force is generated between the stator 5 and the rotor 1 by the magnetic field generated by the current in the coils 55 and the magnetic field of the permanent magnets 18 , causing the rotor 1 to rotate.
  • the rotary shaft 20 fixed to the rotor 1 also rotates.
  • the rolling piston 73 attached to the eccentric shaft portion 20 a eccentrically rotates in the cylinder chamber 72 as indicated by the arrow in FIG. 9 .
  • the operation chamber communicating with the suction port 77 functions as the suction chamber, and sucks a low-pressure refrigerant gas.
  • the refrigerant gas supplied from the accumulator 81 is supplied through the suction port 77 to the cylinder chamber 72 .
  • the refrigerant gas sucked into the cylinder chamber 72 is compressed by the eccentric rotation of the rolling piston 73 .
  • the high-pressure refrigerant gas compressed is discharged from the discharge port into the sealed container 80 .
  • the refrigerant gas discharged from the cylinder chamber 72 into the sealed container 80 passes through the air holes 14 of the second core 10 B and the gap between the rotor 1 and the stator 5 and rises in the sealed container 80 .
  • the refrigerant rising inside the sealed container 80 is discharged through the discharge pipe 85 and sent out to the refrigerant circuit of the refrigeration cycle apparatus 200 ( FIG. 21 ).
  • the refrigerant oil retained at the bottom of the sealed container 80 is mixed with the refrigerant gas discharged from the compression mechanism 7 . If the refrigerant oil is discharged from the compressor 8 together with the refrigerant, the refrigerant oil to be supplied to the compression mechanism 7 may become depleted. A shortage of the refrigeration oil leads to reduced lubrication of the sliding portions of the compression mechanism 7 , or inadequate sealing between parts of the compression mechanism 7 .
  • the separation between the refrigerant gas and the refrigerant oil is promoted.
  • the refrigerant oil is separated from the refrigerant gas, returns to the bottom of the sealed container 80 , and is supplied to the compression mechanism 7 . That is, the shortage of the refrigerant oil can be avoided.
  • the motor 6 is of a consequent pole type, and the permanent magnet 18 is provided at the magnet magnetic pole P 1 ( FIG. 4 ), but no permanent magnet 18 is provided at the pseudo magnetic pole P 2 ( FIG. 4 ).
  • the pseudo magnetic pole P 2 weakly attracts magnetic flux, as compared to the magnet magnetic pole P 1 .
  • the magnetic flux flowing in the rotor core 10 is likely to flow to the rotary shaft 20 .
  • a part of the compression mechanism 7 ( FIG. 1 ) in contact with the rotary shaft 20 may be magnetized.
  • the main bearing 75 or auxiliary bearing 76 may be magnetized because it is made of a magnetic material and is in contact with the rotary shaft 20 .
  • wear debris are likely to be adsorbed to the part, and the operating resistance of the compression mechanism 7 may increase.
  • the rotor core 10 has the first core 10 A and the second core 10 B, and the permanent magnet 18 is fixed to the first core 10 A, while the rotary shaft 20 is fixed to the second core 10 B. Further, the inner circumference of the hole portion 15 A of the first core 10 A is distanced from the rotary shaft 20 .
  • the magnetic flux of the permanent magnets 18 is less likely to flow to the rotary shaft 20 .
  • the magnetic flux leakage to the rotary shaft 20 can be reduced, and therefore the adsorption of wear debris to the compression mechanism 7 can be prevented.
  • the second core 10 B has the slit hole 11 B communicating with the magnet insertion hole 11 A of the first core 10 A.
  • the length W 1 and width T 1 of the magnet insertion hole 11 A and the length W 2 and width T 2 of the slit hole 11 B satisfy W2>W1 and T2>T1.
  • the permanent magnet 18 in the magnet insertion hole 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and therefore the flow of magnetic flux from the permanent magnet 18 to the second core 10 B can be suppressed.
  • the electromagnetic steel sheets constituting the first core 10 A and the electromagnetic steel sheets constituting the second core 10 B can be formed in the same shape, except for the hole portion 15 A and the shaft hole 15 B.
  • the manufacturing process can be simplified, and therefore manufacturing cost can be reduced.
  • the distance R 1 is a distance from the central axis C 1 to the inner circumference of the hole portion 15 A of the first core 10 A.
  • the distance R 2 is a distance from the central axis C 1 to the inner circumference of the shaft hole 15 B of the second core 10 B.
  • the distance R 3 is a distance from the central axis C 1 to the outer circumference 16 A of the first core 10 A.
  • the radius of the rotary shaft 20 can be considered to be the same as the distance R 2 .
  • a difference between the distance R 1 and the distance R 2 (R1 ⁇ R2) corresponds to the shortest distance from the rotary shaft 20 to the first core 10 A. Meanwhile, a difference between the distance R 3 and the distance R 1 (R3 ⁇ R1) corresponds to the width of the first core 10 A in the radial direction, i.e., the width of the magnetic path.
  • the distances R 1 , R 2 , and R 3 described above are determined so as not to cause the magnetic saturation in the first core 10 A while reducing the magnetic flux leakage to the rotary shaft 20 .
  • the induced voltage is a voltage induced in the coil 55 of the stator 5 by the magnetic field of the permanent magnet 18 when the rotor 1 rotates. As the induced voltage increases, higher motor efficiency can be obtained.
  • FIG. 10 is a graph illustrating the relationship between (R1 ⁇ R2)/(R3 ⁇ R1) and the induced voltage.
  • the horizontal axis represents (R1 ⁇ R2)/(R3 ⁇ R1), and the vertical axis represents the induced voltage expressed as a relative value.
  • the maximum value of the induced voltage is denoted by Vh.
  • the curve in FIG. 10 indicates the result of analyzing the change in the induced voltage by simulation in which both the distances R 2 and R 3 are set to fixed values and the value of the distance R 1 is varied.
  • the induced voltage is low when (R1 ⁇ R2)/(R3 ⁇ R1) is small. This is because the magnetic flux leakage from the first core 10 A to the rotary shaft 20 is more likely to occur when R1 ⁇ R2 is small, that is, when the distance between the rotary shaft 20 and the first core 10 A is short.
  • the rotor core 10 has the first core 10 A and the second core 10 B in the axial direction, and the first core 10 A has the hole portion 15 A and the magnet insertion holes 11 A.
  • the permanent magnets 18 in the magnet insertion hole 11 A form the magnet magnetic poles P 1
  • the first core 10 A forms the pseudo magnetic poles P 2 .
  • the second core 10 B has, at its center in the radial direction, the shaft hole 15 B to which the rotary shaft 20 is fixed, and the inner circumference of the hole portion 15 A of the first core 10 A is distanced from the rotary shaft 20 in the radial direction.
  • the second core 10 B is located on the outer side of the stator core 50 in the axial direction.
  • the permanent magnets 18 are fixed to the first core 10 A, the rotary shaft 20 is fixed to the second core 10 B, and the inner circumference of the hole portion 15 A of the first core 10 A is distanced from the rotary shaft 20 .
  • the magnetic flux of the permanent magnets 18 is less likely to flow to the rotary shaft 20 . Therefore, the magnetic flux leakage to the rotary shaft 20 can be reduced. This can suppress the adsorption of wear debris caused by the magnetization of the compression mechanism 7 .
  • the length L 1 of the first core 10 A in the axial direction, the length L 2 of the second core 10 B in the axial direction, and the length Ls of the stator core 50 in the axial direction satisfy L1 ⁇ Ls>L2.
  • the second core 10 B can be disposed outside a region where the magnetic flux flows most, and therefore the magnetic flux is likely to flow in the second core 10 B.
  • the second core 10 B has the slit holes 11 B communicating with the magnet insertion holes 11 A of the first core 10 A.
  • the magnetic flux of the permanent magnets 18 is less likely to flow to the second core 10 B, and therefore the effect of suppressing the magnetic flux leakage to the rotary shaft 20 can be enhanced.
  • the length W 1 in the circumferential direction and the width T 1 in the radial direction of the magnet insertion hole 11 A and the length L 2 in the circumferential direction and the width T 2 in the radial direction of the slit hole 11 B satisfy W2 ⁇ W1 and T2 ⁇ T1.
  • the shape of the electromagnetic steel sheet of the first core 10 A and the shape of the electromagnetic steel sheet of the second core 10 B are similar for the most part. Thus, the manufacturing cost can be reduced.
  • the through hole 13 penetrates the first core 10 A and the second core 10 B in the axial direction, the through hole 13 is used as a rivet hole, so that the first core 10 A and the second core 10 B can be fastened together.
  • the second core 10 B has the plurality of air holes 14 around the shaft hole 15 B, and the magnetic flux is less likely to flow from the second core 10 B to the rotary shaft 20 . Since at least one air hole 14 communicates with the cavity portion inside the hole portion 15 A of the first core 10 A, the separation between the refrigerant and the refrigerant oil can be promoted by the air hole 14 .
  • the distance R 1 from the central axis C 1 to the inner circumference of the hole portion 15 A of the first core 10 A, the distance R 2 from the central axis C 1 to the inner circumference of the shaft hole 15 B of the second core 10 B, and the distance R 3 from the central axis C 1 to the outer circumference 16 A of the first core 10 A satisfy 0.41 ⁇ (R1 ⁇ R2)/(R3 ⁇ R1) ⁇ 0.72.
  • the magnetic flux leakage to the rotary shaft 20 can be reduced, and high motor efficiency can be achieved.
  • FIG. 11 is a diagram illustrating a second core 10 B of a first modification of the first embodiment.
  • the shapes of slit holes 17 differ from those of the slit holes 11 B ( FIG. 6 ) of the first embodiment.
  • the slit hole 17 has an inner end edge 171 located on the inner side in the radial direction, an outer end edge 172 located on the outer side in the radial direction, and side end edges 173 located on both sides in the circumferential direction.
  • the outer end edge 172 corresponds to the outer end edge 112 of the magnet insertion hole 11 A ( FIG. 5 ).
  • the inner end edge 171 is formed at the same position in the radial direction as that of the air hole 14 and extends in an arc shape along the shaft hole 15 B.
  • Each side end edge 173 extends linearly in the radial direction.
  • the length W 2 of the slit hole 17 in the circumferential direction i.e., the length of the outer end edge 172 , is greater than or equal to the length W 1 of the magnet insertion hole 11 A ( FIG. 7 (A) ).
  • the width T 2 of the slit hole 17 in the radial direction i.e., the distance between the inner end edge 171 and the outer end edge 172 , is wider than the width T 1 of the magnet insertion hole 11 A ( FIG. 7 (A) ).
  • One through hole 13 and one air hole 14 are formed between slit holes 17 adjacent to each other in the circumferential direction.
  • Each of the through hole 13 and the air hole 14 is formed at a position in the circumferential direction that corresponds to the pseudo magnetic pole P 2 .
  • two or more through holes 13 or two or more air holes 14 may be formed between the slit holes 17 adjacent to each other in the circumferential direction.
  • the permanent magnets 18 ( FIG. 7 (A) ) in the magnet insertion holes 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and thus the flow of magnetic flux from the permanent magnets 18 to the second core 10 B can be suppressed. Since the area of the slit holes 17 is large and the area of portions serving as the magnetic paths in the second core 10 B is small, the magnetic flux is less likely to flow from the second core 10 B to the rotary shaft 20 . Thus, the effect of reducing the magnetic flux leakage can be enhanced.
  • FIG. 12 (A) is a schematic diagram illustrating magnet insertion holes 21 A of a first core 10 A of a second modification.
  • FIG. 12 (B) is a schematic diagram illustrating slit holes 21 B of a second core 10 B of the second modification.
  • two magnet insertion holes 21 A are provided for each magnetic pole in the first core 10 A, and a bridge 23 A is formed between the magnet insertion holes 21 A.
  • the two magnet insertion holes 21 A are arranged side by side linearly in a direction perpendicular to the magnetic pole center line.
  • One permanent magnet 18 is inserted in each magnet insertion hole 21 A.
  • Each magnet insertion hole 21 A has an inner end edge 211 located on the inner side in the radial direction, an outer end edge 212 located on the outer side in the radial direction, a side end edge 213 located on the outer side in the circumferential direction, and a side end edge 214 located on the bridge 23 A side.
  • the inner end edge 211 and the outer side end edge 212 extend in the direction perpendicular to the magnetic pole center line.
  • the side end edge 213 is inclined such that a distance from the magnetic pole center line increases outward in the radial direction.
  • a flux barrier 22 is formed on the side end edge 213 side of each magnet insertion hole 21 A.
  • the magnet insertion hole 21 A has a length W 1 in the circumferential direction and a width T 1 in the radial direction.
  • the length W 1 is a length of the outer end edge 212
  • the width T 1 is a distance between the inner end edge 211 and the outer end edge 212 .
  • the second core 10 B is provided with two slit holes 21 B corresponding to two magnet insertion holes 21 A, and a bridge 23 B is formed between the two slit holes 21 B.
  • Each slit hole 21 B is formed at a position that overlaps the magnet insertion hole 21 A.
  • Each slit hole 21 B has an inner end edge 215 located on the inner side in the radial direction, an outer end edge 216 located on the outer side in the radial direction, a side end edge 217 located on the outer side in the circumferential direction, and a side end edge 218 located on the bridge 23 B side.
  • These end edges 215 , 216 , 217 , and 218 correspond to the end edges 211 , 212 , 213 , and 214 of the magnet insertion hole 21 A, respectively.
  • the slit hole 21 B has a length W 2 in the circumferential direction and a width T 2 in the radial direction.
  • the length W 2 is a length of the outer end edge 216
  • the width T 2 is a distance between the inner end edge 215 and the outer end edge 216 .
  • the length W 1 and width T 1 of the magnet insertion hole 21 A and the length W 2 and width T 2 of the slit hole 21 B satisfy W2 ⁇ W1 and T2 ⁇ T1.
  • the permanent magnet 18 in the magnet insertion hole 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and therefore the flow of magnetic flux from the permanent magnet 18 to the second core 10 B can be suppressed.
  • the slit hole 21 B does not necessarily have the same shape as the magnet insertion hole 21 A.
  • the slit hole 21 B may have a shape that surrounds the magnet insertion hole 21 A from outside in a plane perpendicular to the axial direction.
  • the two slit holes 21 B illustrated in FIG. 12 (B) may constitute one continuous slit hole instead of being divided by the bridge 23 B.
  • FIG. 13 (A) is a schematic diagram illustrating magnet insertion holes 31 A of a first core 10 A of a third modification.
  • FIG. 13 (B) is a schematic diagram illustrating slit holes 31 B of a second core 10 B of the third modification.
  • two magnet insertion holes 31 A are provided for each magnetic pole in the first core 10 A, and a bridge 33 A is formed between the magnet insertion holes 31 A.
  • the two magnet insertion holes 31 A are arranged to form a V shape such that the pole center sides thereof protrude inward in the radial direction.
  • One permanent magnet 18 is inserted in each magnet insertion hole 31 A.
  • the magnet insertion hole 31 A has an inner end edge 311 located on the inner side in the radial direction, an outer end edge 312 located on the outer side in the radial direction, a side end edge 313 located on the outer side in the circumferential direction, and a side end edge 314 located on the bridge 33 A side.
  • the inner end edge 311 and the outer end edge 312 are parallel to each other and each extend at an inclination with respect to the magnetic pole center line.
  • the side end edge 313 extends in parallel to the magnetic pole center line.
  • a flux barrier 32 is formed on the side end edge 313 side of each magnet insertion hole 31 A.
  • Each magnet insertion hole 31 A has a length W 1 in the circumferential direction and a width T 1 in the radial direction.
  • the length W 1 is a length of the outer end edge 312
  • the width T 1 is a distance between the inner end edge 311 and the outer end edge 312 .
  • the second core 10 B is provided with two slit holes 31 B corresponding to the two magnet insertion holes 31 A, and a bridge 33 B is formed between the two slit holes 31 B.
  • Each slit hole 31 B is formed at a position that overlaps the magnet insertion hole 31 A.
  • the slit hole 31 B has an inner end edge 315 located on the inner side in the radial direction, an outer end edge 316 located on the outer side in the radial direction, a side end edge 317 located on the outer side in the circumferential direction, and a side end edge 318 located on the bridge 33 B side.
  • These end edges 315 , 316 , 317 , and 318 correspond to the end edges 311 , 312 , 313 , and 314 of the magnet insertion hole 31 A, respectively.
  • Each slit hole 31 B has a length W 2 in the circumferential direction and a width T 2 in the radial direction.
  • the length W 2 is a length of the outer end edge 316
  • the width T 2 is a distance between the inner end edge 315 and the outer end edge 316 .
  • the length W 1 and width T 1 of the magnet insertion hole 31 A and the length W 2 and width T 2 of the slit hole 31 B satisfy W2 ⁇ W1 and T2 ⁇ T1.
  • the permanent magnet 18 in the magnet insertion hole 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and therefore the flow of magnetic flux from the permanent magnet 18 to the second core 10 B can be suppressed.
  • the slit hole 31 B does not necessarily have the same shape as the magnet insertion hole 31 A.
  • the slit hole 31 B may have a shape that surrounds the magnet insertion hole 31 A from outside in a plane perpendicular to the axial direction.
  • the two slit holes 31 B illustrated in FIG. 13 (B) may constitute one continuous V-shaped slit hole instead of being divided by the bridge 33 B.
  • FIG. 14 (A) is a schematic diagram illustrating a magnet insertion hole 41 A of a first core 10 A of a fourth modification.
  • FIG. 14 (B) is a schematic diagram illustrating a slit hole 41 B of a second core 10 B of the fourth modification.
  • one magnet insertion hole 41 A is provided for each magnetic pole in the first core 10 A.
  • the magnet insertion hole 41 A has a V shape such that the pole center protrudes inward in the radial direction.
  • Two permanent magnets 18 are inserted in each magnet insertion hole 41 A.
  • the magnet insertion hole 41 A has an inner end edge 411 located on the inner side in the radial direction, an outer end edge 412 located on the outer side in the radial direction, and side end edges 413 located on both sides in the circumferential direction. Both the inner end edge 411 and the outer end edge 412 extend in the V-shape and are parallel to each other. The side end edges 413 extend in parallel to the magnetic pole center line.
  • a flux barrier 42 is formed on each side end edge 413 side of the magnet insertion hole 41 A.
  • the magnet insertion hole 41 A has a length W 1 in the circumferential direction and a width T 1 in the radial direction.
  • the length W 1 is a distance between both ends of the outer end edge 412
  • the width T 1 is a distance between the inner end edge 411 and the outer end edge 412 .
  • the second core 10 B is provided with the slit hole 41 B corresponding to the magnet insertion hole 41 A.
  • the slit hole 41 B is formed at a position that overlaps the magnet insertion hole 41 A.
  • the slit hole 41 B has an inner end edge 415 located on the inner side in the radial direction, an outer end edge 416 located on the outer side in the radial direction, and side end edges 417 located on both sides in the circumferential direction. These end edges 415 , 416 , and 417 correspond to the end edges 411 , 412 , and 413 of the magnet insertion hole 41 A, respectively.
  • Each slit hole 41 B has a length W 2 in the circumferential direction and a width T 2 in the radial direction.
  • the length W 2 is a distance between both ends of the outer end edge 416
  • the width T 2 is a distance between the inner end edge 415 and the outer end edge 416 .
  • the length W 1 and width T 1 of the magnet insertion hole 41 A and the length W 2 and width T 2 of the slit hole 41 B satisfy W2 ⁇ W1 and T2 ⁇ T1.
  • the permanent magnet 18 in the magnet insertion hole 11 A can be prevented from coming into contact with the core portion of the second core 10 B, and therefore the flow of magnetic flux from the permanent magnet 18 to the second core 10 B can be suppressed.
  • the slit hole 41 B does not necessarily have the same shape as the magnet insertion hole 41 A.
  • the slit hole 41 B may have a shape that surrounds the magnet insertion hole 41 A from outside in a plane perpendicular to the axial direction.
  • FIG. 15 is a longitudinal-sectional view illustrating a motor of a second embodiment.
  • the motor of the second embodiment differs from the motor 6 of the first embodiment in that a second core 10 B of a rotor 1 A is disposed on the compression mechanism 7 side ( FIG. 1 ), i.e., on the lower side in FIG. 15 .
  • the second core 10 B is located at a position protruding from the stator core 50 toward the compression mechanism 7 side ( FIG. 1 ). More specifically, a first end surface 103 of the second core 10 B is located on the compression mechanism 7 side with respect to the first end surface 501 of the stator core 50 .
  • the first core 10 A faces the stator core 50 in the radial direction.
  • the permanent magnets 18 are inserted in the magnet insertion holes 11 A of the first core 10 A.
  • Each permanent magnet 18 is located between both the end surfaces 501 and 502 of the stator core 50 in the axial direction.
  • the second core 10 B has the slit holes 11 B communicating with the first cores 10 A.
  • the magnet insertion holes 11 A and the slit holes 11 B are as described in the first embodiment. It is also possible to provide the magnet insertion holes and the slit holes described in the first to fourth modifications.
  • the motor of the second embodiment is configured in a similar manner to the motor 6 of the first embodiment in other respects.
  • the permanent magnets 18 are fixed to the first core 10 A, the rotary shaft 20 is fixed to the second core 10 B, and the inner circumference of the hole portion 15 A of the first core 10 A is distanced from the rotary shaft 20 .
  • the magnetic flux of the permanent magnets 18 is less likely to flow to the rotary shaft 20 , and the magnetic flux leakage to the rotary shaft 20 can be reduced.
  • FIG. 16 is a longitudinal-sectional view illustrating a motor of a third embodiment.
  • the motor of the third embodiment differs from the motor 6 of the first embodiment in that two second cores 10 B are provided on both sides in the axial direction of the first core 10 A of a rotor 1 B.
  • One of the second cores 10 B is located at a position protruding from the stator core 50 toward the compression mechanism 7 side ( FIG. 1 ).
  • the first end surface 103 of this second core 10 B is located on the compression mechanism 7 side ( FIG. 1 ) with respect to the first end surface 501 of the stator core 50 .
  • the other of the second cores 10 B is located at a position protruding from the stator core 50 toward the side opposite to the compression mechanism 7 ( FIG. 1 ).
  • the first end surface 103 of this second core 10 B is located on the side opposite to the compression mechanism 7 ( FIG. 1 ) with respect to the second end surface 502 of the stator core 50 .
  • the first core 10 A faces the stator core 50 in the radial direction.
  • the permanent magnets 18 are inserted in the magnet insertion holes 11 A of the first core 10 A.
  • Each permanent magnet 18 is located between both end surfaces 501 and 502 of the stator core 50 in the axial direction.
  • Each of the second cores 10 B has the slit holes 11 B communicating with the magnet insertion holes 11 A of the first core 10 A.
  • the magnet insertion holes 11 A and the slit holes 11 B are as described in the first embodiment. It is also possible to provide the magnet insertion holes and the slit holes described in the first to fourth modifications.
  • the motor of the third embodiment is configured in a similar manner to the motor 6 of the first embodiment in other respects.
  • the magnetic flux of the permanent magnets 18 is less likely to flow to the rotary shaft 20 .
  • the magnetic flux leakage to the rotary shaft 20 can be reduced.
  • the rotation of the rotor 1 B can be stabilized because the second cores 10 B on both ends in the axial direction of the rotor 1 B are fixed to the rotary shaft 20 .
  • FIG. 17 is a longitudinal-sectional view illustrating a rotor 1 C of a motor of a fourth embodiment.
  • the rotor 1 C of the fourth embodiment differs from the motor 6 of the first embodiment in that the outer diameter of the second core 10 B is smaller than that of the first core 10 A.
  • a distance R 4 from the central axis C 1 to the outer circumference 16 B of the second core 10 B is smaller than a distance R 3 from the central axis C 1 to the outer circumference 16 A of the first core 10 A.
  • the outer diameter of the second core 10 B is smaller than the outer diameter of the first core 10 A.
  • the second core 10 B has the slit holes 11 B communicating with the magnet insertion holes 11 A of the first core 10 A.
  • the magnet insertion holes 11 A and the slit holes 11 B are as described in the first embodiment. It is also possible to provide the magnet insertion holes and the slit holes described in the first to fourth modifications.
  • the motor of the fourth embodiment is configured in a similar manner to the motor 6 of the first embodiment in other respects.
  • the outer diameter of the second core 10 B is smaller than the outer diameter of the first core 10 A, and thus the area of portions serving as the magnetic paths in the second core 10 B is small.
  • the magnetic flux is less likely to flow from the second core 10 B to the rotary shaft 20 , and therefore the effect of reducing the magnetic flux leakage to the rotary shaft 20 can be enhanced.
  • the outer diameter of the second core 10 B may be smaller than the outer diameter of the first core 10 A.
  • FIG. 18 is a longitudinal-sectional view illustrating a rotor 1 D of a motor of a fifth embodiment.
  • the rotor 1 D of the fifth embodiment differs from the motor 6 of the first embodiment in that an end plate 9 A is disposed between the first core 10 A and the second core 10 B.
  • the end plate 9 A is disposed between the second end surface 102 of the first core 10 A and the first end surface 103 of the second core 10 B.
  • the end plate 9 A is annular and has an inner circumference 91 and an outer circumference 92 .
  • the inner circumference 91 of the end plate 9 A is located at the same position in the radial direction as the inner circumference of the hole portion 15 A of the first core 10 A
  • the outer circumference 92 of the end plate 9 A is located at the same position in the radial direction as the outer circumference 16 A of the first core 10 A.
  • the inner circumference 91 and the outer circumference 92 of the end plate 9 A may not necessarily be located at the positions described above. That is, the end plate 9 A may cover at least the end in the axial direction of the magnet insertion hole 11 A of the first core 10 A.
  • the end plate 9 A also has through holes 93 located at the positions corresponding to the through holes 13 of the first core 10 A and the second core 10 B.
  • the first core 10 A, the second core 10 B, and the end plate 9 A are fastened together by the rivets 19 inserted through the through holes 13 and the through holes 93 .
  • the end plate 9 A is made of a nonmagnetic material such as stainless steel. Since the end plate 9 A which is a nonmagnetic member is disposed between the first core 10 A and the second core 10 B, the flow of the magnetic flux of the permanent magnets 18 to the second core 10 B is suppressed. As a result, the effect of reducing the magnetic flux leakage to the rotary shaft 20 can be enhanced.
  • Another end plate 9 B may be provided on the end surface 101 of the first core 10 A on the side opposite to the second core 10 B.
  • the shape and material of the end plate 9 B are the same as those of the end plate 9 A.
  • the end plate 9 B is fixed to the first core 10 A by the rivets 19 .
  • the motor of the fifth embodiment is configured in a similar manner to the motor 6 of the first embodiment in other respects.
  • the flow of the magnetic flux of the permanent magnets 18 to the second core 10 B is suppressed because the nonmagnetic end plate 9 A is disposed between the first core 10 A and the second core 10 B.
  • the effect of reducing the magnetic flux leakage to the rotary shaft 20 can be enhanced.
  • the permanent magnets 18 can be prevented from falling out of the magnet insertion hole 11 A.
  • the end plate 9 A may be provided between the first core 10 A and the second core 10 B.
  • FIG. 19 is a longitudinal-sectional view illustrating a rotor 1 E of a modification of the fifth embodiment.
  • the rotor 1 E differs from the rotor 1 D of the fifth embodiment in that the second core 10 B does not have the slit hole 11 B ( FIG. 18 ).
  • the second core 10 B does not have the slit hole 11 B.
  • the nonmagnetic end plate 9 A is disposed between the first core 10 A and the second core 10 B as described above, and thus the flow of the magnetic flux of the permanent magnets 18 to the second core 10 B can be suppressed.
  • the magnetic flux leakage to the rotary shaft 20 can be reduced.
  • the manufacturing process can be simplified and the manufacturing cost can be reduced.
  • the motor of this modification is configured in a similar manner to the motor of the fifth embodiment in other respects.
  • the first end surface 101 of the first core 10 A is located at the same position in the radial direction as the first end surface 501 of the stator core 50 , but the first core 10 A may protrude from the stator core 50 toward the compression mechanism 7 side as in a rotor 1 F illustrated in FIG. 20 .
  • a part of the bearing portion 75 b of the main bearing 75 in the compression mechanism 7 can be located inside the hole portion 15 A of the first core 10 A.
  • the permanent magnets 18 are not disposed in the magnet insertion holes 11 A.
  • the permanent magnets 18 are located between both end surfaces 501 and 502 of the stator core 50 in the axial direction. This can prevent the magnetic flux of the permanent magnets 18 from affecting the bearing portion 75 b formed of the magnetic material.
  • the through holes 13 and the air holes 14 are provided in the rotor.
  • FIG. 21 is a diagram illustrating the configuration of the refrigeration cycle apparatus 200 .
  • the refrigeration cycle apparatus 200 illustrated in FIG. 21 is an air conditioner in this example.
  • the refrigeration cycle apparatus 200 is not limited to the air conditioner, and may be a refrigerator, a heat pump cycle apparatus, or the like.
  • the refrigeration cycle apparatus 200 includes the compressor 8 of the first embodiment, a four-way valve 201 as a switching valve, an outdoor heat exchanger 202 , a decompression device 203 , an indoor heat exchanger 204 , and a refrigerant pipe 205 .
  • the compressor 8 , the four-way valve 201 , the outdoor heat exchanger 202 , the decompression device 203 , and the indoor heat exchanger 204 are connected together by the refrigerant pipe 205 to configure a refrigerant circuit.
  • the refrigeration cycle apparatus 200 further includes an outdoor fan 206 facing the outdoor heat exchanger 202 and an indoor fan 207 facing the indoor heat exchanger 204 .
  • a refrigerant containing an ethylene-based hydrofluorocarbon as the refrigerant.
  • ethylene-based hydrofluorocarbon 1,1,2-trifluoroethylene (R1123).
  • R1123 1,1,2-trifluoroethylene
  • the refrigerant is not limited thereto, and other kinds of ethylene-based hydrofluorocarbons may be used. A mixture of two or more kinds of ethylene-based hydrofluorocarbons may be used.
  • R1123 1,1,2-trifluoroethylene
  • R32 difluoromethane
  • the mixture desirably contains 40 to 60 weight percent of R1123 and the remaining weight percent of R32.
  • R1123 and R32 may be replaced with another substance.
  • R1123 may be replaced with another ethylene-based hydrofluorocarbon or may be replaced with a mixture of R1123 and another ethylene-based hydrofluorocarbon.
  • fluoroethylene R1141
  • 1,1-difluoroethylene R1132a
  • trans-1,2-difluoroethylene R1132(E)
  • cis-1,2-difluoroethylene R1132(Z)
  • R32 may be replaced with, for example, any one of 2,3,3,3-tetrafluoropropene (R1234yf), trans-1,3,3,3-tetrafluoropropene (R1234ze(E)), cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)), 1,1,1,2-tetrafluoroethane (R134a), and 1,1,1,2,2-pentafluoroethane (R125).
  • R1234yf 2,3,3,3-tetrafluoropropene
  • R1234ze(E) trans-1,3,3,3-tetrafluoropropene
  • R1234ze(Z) cis-1,3,3,3-tetrafluoropropene
  • R134a 1,1,1,2-tetrafluoroethane
  • R125 1,1,1,2,2-pentafluoroethane
  • R32 may be replaced with, for example, a mixture composed of two or more of R32, R1234yf, R1234ze(E), R1234ze(Z), R134a, and R125.
  • R1123 may be replaced with another ethylene-based hydrofluorocarbon or a mixture of R1123 and another ethylene-based hydrofluorocarbon.
  • the operation of the refrigeration cycle apparatus 200 is as follows.
  • the compressor 8 compresses the sucked refrigerant and discharges the compressed refrigerant as a high-temperature and high-pressure gas refrigerant.
  • the four-way valve 201 switches the flow direction of the refrigerant.
  • the refrigerant discharged from the compressor 8 flows to the outdoor heat exchanger 202 as illustrated by a solid line in FIG. 21 .
  • the outdoor heat exchanger 202 operates as a condenser.
  • the outdoor heat exchanger 202 exchanges heat between the refrigerant discharged from the compressor 8 and outdoor air supplied by the outdoor fan 206 to condense the refrigerant and then discharges the condensed refrigerant as a liquid refrigerant.
  • the decompression device 203 decompresses the liquid refrigerant discharged from the outdoor heat exchanger 202 . Consequently, the refrigerant is brought into a two-phase mixed state of the low-temperature and low-pressure gas refrigerant and the low-temperature and low-pressure liquid refrigerant.
  • the indoor heat exchanger 204 operates as an evaporator.
  • the indoor heat exchanger 204 exchanges heat between the refrigerant in the two-phase mixed state and indoor air to evaporate the refrigerant and then discharges the evaporated refrigerant as a single-phase gas refrigerant.
  • Air from which the heat is removed in the indoor heat exchanger 204 is supplied by the indoor fan 207 to the interior of a room, which is a space to be air-conditioned.
  • the four-way valve 201 delivers the refrigerant discharged from the compressor 8 to the indoor heat exchanger 204 .
  • the indoor heat exchanger 204 functions as the condenser
  • the outdoor heat exchanger 202 functions as the evaporator.
  • the magnetic flux leakage to the rotary shaft 20 is suppressed as described in the first embodiment, and thus it is possible to suppress the adsorption of wear debris caused by the magnetization of the compression mechanism 7 . Further, the outflow of the refrigerant oil to the outside of the compressor 8 can also be suppressed. Thus, the reliability of the refrigeration cycle apparatus 200 can be enhanced, and the operating efficiency of the refrigeration cycle apparatus 200 can be improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
US17/999,272 2020-06-25 2020-06-25 Motor, compressor, and refrigeration cycle apparatus Abandoned US20230208223A1 (en)

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